Other ways of attaching are more difficult to remove. My Old Beckman panniers
and the Rain covers I had made for them all was a PIA to pull off but solid as a rock once all tightened down..


A customer had to scramble to replace her Bar Bag when at the start of the trip
someone stole the thing from the seat of the truck her friend drive her to the trip starting point..

Sometimes the 'Not all your eggs in one basket' warning needs remembering.

there was lot of stuff in that small bag the electronics of GPS, & tablets & phones ,passport, etc. add up quick ..